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Wavelet based fault detection, classification and location in existing 500 kV transmission line

Wavelet based fault detection, classification and location i...

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International Conference on electrical engineering/Electronics, Computer, Telecommunications and information technology

作者： Kajoijilertsakul, Pairoj Asawasripongtorn, Santi Sanposh, Peerayot Suwatthikul, Jittiwut Fujita, Hideaki Department of Electrical Engineering Faculty of Engineering Kasetsart University Bangkok Thailand Industrial Control and Automation Laboratory National Electronics and Computer Technology Center Bangkok Thailand Department of Electrical and Electronic Engineering Tokyo Institute of Technology Tokyo Japan

ISBN: (纸本)9781457704246

This paper describes the implementation of Wavelet Transform and Spectral Energy analysis on samples of simulated voltage and current waveforms obtained from PSCAD/EMTDC for each of the all possible fault scenarios in a modeled 500 kV transmission network. The fault detection and classification of each fault scenarios is determined based on results of the voltage and current waveforms analysis in time and wavelet domains. The analysis is carried out including variation in fault types, inception angles and locations with a practically arbitrarily assumed fault duration. The analytical results shows that the described technique is highly dependable and is able to detect and classify different kinds of faults along a transmission line whatever is the fault type, inception angle and location. © 2011 IEEE.

关键词： Wavelet transforms

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Voice signal's noise reduction using adaptive/reconfigurable filters for the command of an industrial robot

Voice signal's noise reduction using adaptive/reconfigurable...

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11th WSEAS International Conference on Signal Processing, Computational Geometry and Artificial Vision, ISCGAV'11, 11th WSEAS International Conference on Systems Theory and Scientific Computation, ISTASC'11

作者： Claudia, Moisa Maria, Silaghi Helga Ulrich, Rohde L. Paul, Silaghi Andrei, Silaghi Marius, Silaghi A. Department of Electrical Engineering University of Oradea Faculty of Electrical Engineering and Information Technology 1 University 410087 Oradea Romania Department of Electrical Drives and Automation University of Oradea Faculty of Electrical Engineering and Information Technology 1 University 410087 Oradea Romania Department of Communications Technical University of Cottbus Germany Politehnica University of Timisoara 2 Vasile Parvan Bv Timisoara Romania

This paper presents a voice signal's noise reduction using adaptive / reconfigurable filters for ordering an industrial robot using isolated words. Finally, some results of the simulation are presented.

ISBN: (纸本)9781618040275

关键词： Speech recognition

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An anti-slip predictive controller for a V-PRA vehicle

An anti-slip predictive controller for a V-PRA vehicle

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作者： Cochior, Carmen De Keyser, Robin Lazar, Corneliu Electrical Engineering Department Eindhoven University of Technology Eindhoven Netherlands EeSA-Department of Electrical Energy Systems and Automation Ghent University Ghent Belgium Department of Automatic Control and Applied Informatics Faculty of Automatic Control and Computer Engineering Technical University Gh. Asachi Iasi Romania

ISBN: (纸本)9783902661937

In this paper an anti-slip predictive controller is designed and implemented in order to control the rear wheels of a V-PRA (Variable Powered Rear Axle) vehicle. The control algorithm is EPSAC, a Model based Predictive control (MPC) strategy. It uses explicitly a model of the system for the prediction of the future system output, in order to calculate the optimal control input which will bring the system to a required setpoint. The main goals of this predictive controller were setpoint trajectory following, disturbance rejection and maintain overall the stability of the V-PRA vehicle. Although the process is nonlinear, being influenced by several parameters, linear discrete-time ARX models could be obtained based on system linearization around an operating point. An initial SISO controller was developed and tested, based on a Simulink model of the process. The control performances were tested successfully in presence of all kind of disturbances, denoting a robust controller. © 2011 IFAC.

关键词： Vehicles

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LCCT-Z-Source inverters

LCCT-Z-Source inverters

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International Conference on Environment and electrical engineering

作者： Adamowicz, Marek Department of Ship Automation Gdynia Maritime University Gdynia Poland National Centre for R and D Programme LIDER Faculty of Electrical and Control Engineering Gdansk University of Technology Poland

ISBN: (纸本)9781424487820

Many renewable generation units (e.g. PVs, fuel cells, small wind turbines) require integrated DC-AC converters providing efficient high step-up power conversion. On the basis of recent developments in impedance source (Z-source) inverters the present paper proposes an integration of quasi-Z-source inverter (qZSI) with a built-in high frequency transformer. Two new type LCCT-Z-Source inverters are presented by author. Proposed inverters characterize continuous input current, improved relationship between boost coefficient and modulation index and improved EMI performance. Application of four element (Inductor Capacitor Capacitor Transformer) LCCT impedance network provides higher voltage gain than obtained in quasi-Z-source inverter. The advantage of proposed topology over other recently developed trans Z-source inverters (TZSI) is that two built-in capacitors block DC currents in transformer windings and prevents core saturation. Simulation and experimental results are shown to verify the proposed topologies. © 2011 IEEE.

关键词： Topology

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Theoretical limitations in vehicle system dynamics

Theoretical limitations in vehicle system dynamics

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15th WSEAS International Conference on Systems, Part of the 15th WSEAS CSCC Multiconference

作者： Katerina, Hyniova Jaroslav, Honcu Department of Digital Design Czech Technical University in Prague Faculty of Information Technology Kolejni 2 Prague 6 Czech Republic Department of Control Engineering Czech Technical University in Prague Faculty of Electrical Engineering Technicka 2 Prague 6 Czech Republic

ISBN: (纸本)9781618040237

It is often assumed that if practical difficulties are neglected, active systems could in principle produce arbitrary ideal behavior. This paper presents the factorization approach that is taken to derive limitations of achievable frequency responses for active vehicle suspension systems in terms of invariant frequency points and restricted rate of decay at high frequencies. The factorization approach enables to determine complete sets of such constraints on various transfer functions from the load and road disturbance inputs for typical choices of measured outputs and then choose the "most advantageous" vector of the measurements from the point of view of the widest class of the achievable frequency responses. Using a simple linear two degree-of-freedom car suspension system model it will be shown that even using complete state feedback and in the case of in which the system is controllable in the control theory sense, there still are limitations to suspension performance in the fully active state. In control law design for active suspension system of vehicles it is demanded to prevent magnitudes of the road and load frequency responses from being too large. The paper aims to show that there are some frequency points and frequency ranges where the transfer functions have modulus strictly greater than one i.e. where road and load disturbance amplification occurs. On the base of the Bode integral theorems a proof will be given to show that the transfer functions must be greater in modulus to at least the same extend that it is less than one, when measured in terms of the area on a Bode magnitude plot. In such a case there is a possibility to shift frequency ranges where disturbance amplification occurs to a "more advantageous place" or to make magnitudes lower spreading the frequency range.

关键词： Frequency response

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Feedback design for the Acrobot walking-like trajectory tracking and computational test of its exponential stability

Feedback design for the Acrobot walking-like trajectory trac...

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1st Joint Symposium on Computer-Aided control System Design, CACSD 2011 and Systems with Uncertainty, SU 2011

作者： Anderle, Milan Čelikovský, Sergej Czech Technical University in Prague Faculty of Electrical Engineering Department of Control Engineering Technická 2 166 27 Prague Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic Pod Vodárenskou věží 4 182 08 Prague Czech Republic

ISBN: (纸本)9781457710667

This paper aims to the further improve of the previously developed design for the Acrobot walking based on the partial exact feedback linearization of order 3. Namely, such an exact system transformation leads to an almost linear system where error dynamics along trajectory to be tracked is a 4 dimensional linear time varying system having 3 time varying entries only. Unlike previous approaches treating time varying entries as uncertainties with various extent of conservatism, the present paper takes into the account an information about these time varying functions including their derivatives up to order 4. Using that, the time varying state and the feedback transformation enable to design a fundamental matrix of the error dynamics in an explicit form and pre-designed stability properties. In particular, product of that fundamental matrix at the end of the single support walking phase by the impact map Jacobian enables directly prove stability of the hybrid cyclic walking like trajectory by computing certain 44 matrix and determining numerically whether its eigenvalues lie within the unit circle. This combination of analytical and numerical computations provides the justification of the exponential stability of the walking-like trajectory tracking. Moreover, it is supported by numerical simulations showing practically unlimited number of steps of the Acrobot "walking". © 2011 IEEE.

关键词： Trajectories

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Stability analysis of the Acrobot walking with observed geometry

Stability analysis of the Acrobot walking with observed geom...

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ISBN: (纸本)9783902661937

This paper aims to extend of the previously developed analytical design for the Acrobot walking. The corresponding state feedback controller is completed in this paper by an observer to estimate some states of the Acrobot. Both the controller and the observer are based on the partial exact feedback linearization of order 3. The feedback controller and the observer are extended for the tracking of the cyclic walking-like trajectory in order to demonstrate the cyclic Acrobot walking. The cyclic walking-like trajectory starts continuous phase from certain initial conditions, that at the end of the step makes an impact and after the impact it reaches the same initial conditions as at the beginning of the step. This cyclic motion of the Acrobot enable us to prove the stability of the feedback tracking with the observer numericaly by the method of Poincaré mappings. This numerical proof of the stability is supported by numerical simulations showing practically unlimited number of steps of the stable Acrobot walking. © 2011 IFAC.

关键词： Stability

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Identification of Hammerstein-Wiener ARMAX Systems Using Extended Kalman Filter

Identification of Hammerstein-Wiener ARMAX Systems Using Ext...

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2011 Chinese control and Decision Conference（CCDC）

作者： M.Mansouri H.Tolouei M.Aliyari Shoorehdeli Intelligent System Laboratory (ISLAB) faculty of Electrical EngineeringControl departmentK.N.Toosi University of Technology Advanced Process Automation & Control Laboratory (APAC) faculty of Electrical EngineeringControl departmentK.N.Toosi University of Technology Advanced Process Automation & Control Laboratory (APAC) faculty of Electrical EngineeringMechatronics departmentK.N.Toosi University of Technology

In this study,Extended Kalman Filter (EKF) algorithm is developed to estimate the parameters of Hammerstein-Wiener (H-W) ARMAX *** basic idea is to estimate the original parameters of the identification model,which are appeared in the form of product terms,***,other algorithms like Extended Forgetting Factor Stochastic Gradient (EFG),Extended Stochastic Gradient (ESG),Forgetting Factor Recursive Least Square (FFRLS) and Kalman Filter (KF),estimate parameters in the product form and they need another algorithms such averaging method (AVE method),singular value decomposition method (SVD method) to separate the ***,the computational complexity of the proposed approach *** show the efficiency of this method the results are compared with EFG and ESG method.

关键词： Hammerstein-Wiener model,Extended Kalman Filter algorithm,Extended Stochastic Gradient algorithm,Extended Forgetting Factor Stochastic Gradient algorithm

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Motor bearing diagnostics performed by means of laser vibrometer

Motor bearing diagnostics performed by means of laser vibrom...

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IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED)

作者： A. Dzwonkowski L. Swedrowski L. Swędrowski Department of Metrology and Information Systems Department of Electrical and Control Engineering Gdansk University of Technology Poland Faculty of Electrical Engineering Gdansk University of Technology Poland

Damage of bearings is the most common cause of failures in squirrel-cage induction motors. That is why the issues connected with diagnostics of bearings are so important. The equipment employed for bearing diagnostics usually makes use of vibrations as the criterion for technical condition of the bearings. This paper presents exemplary results of the research conducted on bearings with artificially introduced damage. A scanning laser vibrometer PSV-400 Polytec has been used for vibration measurements. The research of technical condition of the same bearings was simultaneously carried out with the usage of DREAM - a vibration diagnostics system.

关键词： Vibrations Vibrometers Induction motors Measurement by laser beam Ring lasers Vibration measurement Frequency modulation

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Modeling of arc welding power supply

Modeling of arc welding power supply

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International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD

作者： Qing Fang Teng Wei Zhong Zhang Jian Guo Zhu You Guang Guo Department of Automation and Electrical Engineering Lanzhou Jiaotong University Lanzhou China Faculty of Engineering and Information Technology University of Technology Sydney Australia

ISBN: (纸本)9781424478521

This paper gives a method of establishing small-signal model for full-bridge inverter arc welding power supply via state-space averaging treatment and linearization method. On the basis of the model, the frequency response reflecting dynamical characteristics of arc welding power supply is analyzed by means of MATLAB. The simulation result has agreement with experiment result as regards dynamical property. The small signal frequent mathematical model established in the paper can reflect basic characteristic of practical arc welding power system.

关键词： Welding Mathematical model Integrated circuit modeling Power supplies Analytical models Inverters Rectifiers

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